So many beautiful looking tubes in here
Edited by sprite40 - 2/21/14 at 10:45am
Raytheon OB2 gas rectifier in the Studio Six. It was an experiment with Cortex Cam on my iPhone.
You can rest the camera on books or anything. As long as you use the timer it's steady.
Tripod just makes it easier...great tubes...cheers!
The blue glow is caused by electrons bombarding the glass envelope. Some glass will emit blue glow when bombarded by electrons.
It is common in many types of power tubes. My Sovtek 5881 seem to emit more blue as they age, but that is just an observation.
These are 5881 power tubea: